Return to title fetch helper of 1.2

The fetch helper does not obey rules and returns an array of bytes.
Naturally, the templace expansion tracebacks. The proper solution is
to get rid of SGMLhelper and find a parser that returns unicode.
But for now, just back Christian's code out.

README

@@ -11,10 +11,11 @@ TODO:
    - macro variables list - document starting with underscore
    - parse and beautify devel notes (again)
  - make .substitute to return a list-of-strings; million useless .join now
+ - replace sgmllib.SGMLParser with something better. Fails at HTML:
+http://www.reallifecomics.com/
+<title>Real Life Comics - The Online Comic &copy;1999-2010 Greg Dean</title>
 
 fixup TODO for templates:
- - Hitting "Preload" ends with same, in fetch_get()
-   Maybe just drop templating for the helper.
  - remove flooding print from template.py - 'str found:' etc. Kill all print.
  - rename "jsondict" into something sensible
  - http://elanor.zaitcev.lan/slasti/zaitcev/login?savedref=new?

slasti/main.py

@@ -209,7 +209,8 @@ def fetch_body(url):
 #
 # The server-side indirection requires extreme care to prevent abuse.
 # User may hit us with URLs that point to generated pages, slow servers, etc.
-# As the last resort, we never work as a generic proxy.
+# Also, security. As the first defense, we require user to be logged in.
+# As the last resort, we never work as a generic proxy: only return the title.
 #
 def fetch_get(start_response, ctx):
     url = ctx.get_query_arg("url")
@@ -218,10 +219,9 @@ def fetch_get(start_response, ctx):
     body = fetch_body(url)
     title = fetch_parse(body)
 
-    start_response("200 OK", [('Content-type', 'text/plain; charset=utf-8')])
-    # XXX Ewww, why substitute here? Just safe it out. Compare with 1.2.
-    jsondict = { "output": '%s\r\n' % title }
-    return [template_simple_output.substitute(jsondict)]
+    output = ['%s\r\n' % title]
+    start_response("200 OK", [('Content-type', 'text/plain')])
+    return output
 
 def mark_post(start_response, ctx, mark):
     argd = find_post_args(ctx)